# CVE-2026-8793: PaperCut NG/MF: Insufficient brute-force protection

> Attackers can bypass brute-force protections to perform credential stuffing attacks, potentially leading to account takeover.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Aug 2026
- **Updated:** 3 Aug 2026
- **Also known as:** GHSA-845j-gc55-fc8w

## What is CVE-2026-8793?

CVE-2026-8793 is a medium-severity vulnerability in PaperCut NG/MF, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

PaperCut NG/MF does not properly restrict excessive authentication attempts within its login component. An unauthenticated remote attacker can exploit this vulnerability to perform unrestricted brute-force or credential-stuffing attacks without triggering account lockout or rate-limiting mechanisms in some configurations.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts)

## Which versions are affected by CVE-2026-8793?


## How do I fix CVE-2026-8793?

No fix has been published for CVE-2026-8793 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8793 being exploited?

There is no known exploitation of CVE-2026-8793 in the wild and no public exploit code.

Public exploit code:

- Responsible disclosure write-ups for CVE-2026-8793 - PaperCut NG 25.0.11 (github_poc): https://github.com/H4zaz/CVE-2026-8793

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8793 and fix it if it is affected.

What it is: CVE-2026-8793 is a medium-severity vulnerability in PaperCut NG/MF, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-8793 in the wild and no public exploit code.

Affected product: PaperCut NG/MF. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-8793/ (Markdown: https://insights.sbomify.com/CVE-2026-8793/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8793
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8793
- OSV: https://osv.dev/vulnerability/CVE-2026-8793

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-8793/
Summaries are generated and may contain mistakes; the official description above is the record.